Definition: You are given a math word problem and you are supposed to make use of mathematical concepts like probability, combinatorics, linear equations, sequences/series, or simple operators like addition, subtraction, division, or multiplication to answer the given question. Choose the best option from the 5 given options and report that option.
Input: Question: Which oif the following is a prime number?

 Option A: 45

 Option B: 39

 Option C: 27

 Option D: 33

 Option E: 31

Option E